Differential Cases
Circle Track Differential Cases at JJ Motorsports
House your gears securely with robust differential cases from JJ Motorsports, designed for Ford 9in rear ends in circle track racing. These assembled cases with built-in spools ensure reliable torque distribution, reduced weight options, and easy integration for optimal traction and durability in IMCA, USMTS, late models, modifieds, and street stocks under extreme dirt oval conditions.
Shop trusted brands like PEM for lightweight assembled units with various ratios. Explore related categories such as Circle Track Differentials and Rear End Components for complete rear end solutions or Circle Track Ring and Pinion Gears for gear upgrades.
Top Circle Track Differential Cases
- PEM 9in Gear Full Spool 6.50 Ratio New Center Section CSFS65031 – Differential Case Assembled 6.50 Ratio 31 Spline Steel Spool Natural Ford 9 in Each.
- PEM New Center Section FS 7.00 Ratio 31 Spline L/W CSFS70031LW – Differential Case Assembled 7.00 Ratio 31 Spline Steel Spool Ford 9 in Each.
- PEM New Center Section FS 6.83 Ratio 31 Spline L/W CSFS68331LW – Differential Case Assembled 6.83 Ratio 31 Spline Steel Spool Ford 9 in Each.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
PEM 9in Gear Full Spool 6.50 Ratio New Center Section CSFS65031
PEM
$723.99Differential CaseAssembled6.50 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS65031- SKU:
- PEMCSFS65031
- Availability:
- Ships Same Business Day
- Weight:
- 40.00 LBS
$723.99 -
Ford 9 Inch Third Member Assembly, Full Spool, 31-Spline
J J MOTORSPORTS
$1,022.95234-9091- SKU:
- 234-9091
- Availability:
- 1-2 Week Lead Time for Build
- Weight:
- 50.00 LBS
$1,022.95 -
PEM New Center Section FS 7.00 Ratio 31 Spline L/W CSFS70031LW
PEM
$877.99Differential CaseAssembled7.00 Ratio31 SplineSteel SpoolFord 9 inEachPEMCSFS70031LW- SKU:
- PEMCSFS70031LW
- Availability:
- Ships Same Business Day
- Weight:
- 75.00 LBS
$877.99 -
PEM New Center Section FS 6.83 Ratio 31 Spline L/W CSFS68331LW
PEM
$877.99Differential CaseAssembled6.83 Ratio31 SplineSteel SpoolFord 9 inEachPEMCSFS68331LW- SKU:
- PEMCSFS68331LW
- Availability:
- Ships Same Business Day
- Weight:
- 7.00 LBS
$877.99 -
PEM New Center Section FS 6.66 Ratio 31 Spline L/W CSFS66631LW
PEM
$877.99Differential CaseAssembled6.66 Ratio31 SplineSteel SpoolFord 9 inEachPEMCSFS66631LW- SKU:
- PEMCSFS66631LW
- Availability:
- Ships Same Business Day
- Weight:
- 75.00 LBS
$877.99 -
PEM New Center Section FS LW 650 Ratio 31 Spline CSFS65031LW
PEM
$799.99Differential CaseAssembled6.50 Ratio31 SplineSteel SpoolFord 9 inEachPEMCSFS65031LW- SKU:
- PEMCSFS65031LW
- Availability:
- Ships Same Business Day
- Weight:
- 75.00 LBS
$799.99 -
PEM New Center Section FS LW 583 Ratio 31 Spline CSFS58331LW
PEM
$799.99Differential CaseAssembled5.83 Ratio31 SplineSteel SpoolFord 9 inEachPEMCSFS58331LW- SKU:
- PEMCSFS58331LW
- Availability:
- Ships Same Business Day
- Weight:
- 75.00 LBS
$799.99 -
PEM 9in Gear Full Spool 6.33 Ratio New Center Section CSFS63331
PEM
$798.99Differential CaseAssembled6.33 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS63331- SKU:
- PEMCSFS63331
- Availability:
- Ships Same Business Day
- Weight:
- 70.00 LBS
$798.99 -
PEM 9in Gear Full Spool 6.20 Ratio New Center Section CSFS62031
PEM
$798.99Differential CaseAssembled6.20 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS62031- SKU:
- PEMCSFS62031
- Availability:
- Ships Same Business Day
- Weight:
- 42.00 LBS
$798.99 -
PEM 9in Gear Full Spool 5.83 Ratio New Center Section CSFS58331
PEM
$798.99Differential CaseAssembled5.83 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS58331- SKU:
- PEMCSFS58331
- Availability:
- Ships Same Business Day
- Weight:
- 40.00 LBS
$798.99 -
PEM 9in Gear Full Spool 3.70 Ratio New Center 31 CSFS37031
PEM
$798.99Differential CaseAssembled3.70 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS37031- SKU:
- PEMCSFS37031
- Availability:
- Ships Same Business Day
- Weight:
- 74.00 LBS
$798.99 -
PEM 9in Gear Full Spool 5.67 Ratio New Center Section CSFS56731
PEM
$798.999in Gear Full Spool 5.67 Ratio New Center SectionDifferential CaseAssembled5.67 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS56731- SKU:
- PEMCSFS56731
- Availability:
- Ships Same Business Day
- Weight:
- 42.00 LBS
- MFG Part #:
- CSFS56731
$798.99 -
PEM 9in Gear Full Spool 5.43 Ratio New Center Section CSFS54331
PEM
$723.999in Gear Full Spool 5.43 Ratio New Center SectionDifferential CaseAssembled5.43 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS54331- SKU:
- PEMCSFS54331
- Availability:
- Ships Same Business Day
- Weight:
- 42.00 LBS
- MFG Part #:
- CSFS54331
$723.99 -
PEM 9in Gear Full Spool 5.29 Ratio New Center Section CSFS52931
PEM
$798.999in Gear Full Spool 5.29 Ratio New Center SectionDifferential CaseAssembled5.29 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS52931- SKU:
- PEMCSFS52931
- Availability:
- Ships Same Business Day
- Weight:
- 41.00 LBS
- MFG Part #:
- CSFS52931
$798.99Qty in Cart: 0Quantity:Price:$798.99Subtotal: -
PEM 9in Gear Full Spool 5.14 Ratio New Center Section CSFS51431
PEM
$723.999in Gear Full Spool 5.14 Ratio New Center SectionDifferential CaseAssembled5.14 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS51431- SKU:
- PEMCSFS51431
- Availability:
- Ships Same Business Day
- Weight:
- 42.00 LBS
- MFG Part #:
- CSFS51431
$723.99 -
PEM 9in Gear Full Spool 6.00 Ratio New Center Section CSFS60031
PEM
$798.99Differential CaseAssembled6.00 Ratio31 SplineSteel SpoolNaturalFord 9 inEachPEMCSFS60031- SKU:
- PEMCSFS60031
- Availability:
- Ships Same Business Day
- Weight:
- 40.00 LBS
$798.99Qty in Cart: 0Quantity:Price:$798.99Subtotal:
